ANNOUNCE: [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-12:01.openssl
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 = FreeBSD-SA-12:01.opensslSecurity Advisory The FreeBSD Project Topic: OpenSSL multiple vulnerabilities Category: contrib Module: openssl Announced: 2012-05-03 Credits:Adam Langley, George Kadianakis, Ben Laurie, Ivan Nestlerode, Tavis Ormandy Affects:All supported versions of FreeBSD. Corrected: 2012-05-30 12:01:28 UTC (RELENG_7, 7.4-STABLE) 2012-05-30 12:01:28 UTC (RELENG_7_4, 7.4-RELEASE-p8) 2012-05-30 12:01:28 UTC (RELENG_8, 8.3-STABLE) 2012-05-30 12:01:28 UTC (RELENG_8_3, 8.3-RELEASE-p2) 2012-05-30 12:01:28 UTC (RELENG_8_2, 8.2-RELEASE-p8) 2012-05-30 12:01:28 UTC (RELENG_8_1, 8.1-RELEASE-p10) 2012-05-30 12:01:28 UTC (RELENG_9, 9.0-STABLE) 2012-05-30 12:01:28 UTC (RELENG_9_0, 9.0-RELEASE-p2) CVE Name: CVE-2011-4576, CVE-2011-4619, CVE-2011-4109, CVE-2012-0884, CVE-2012-2110 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit URL:http://security.FreeBSD.org/. 0. Revision History v1.0 2012-05-02 Initial release. v1.1 2012-05-30 Updated patch to add SGC and BUF_MEM_grow_clean(3) bug fixes. I. Background FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. II. Problem Description OpenSSL fails to clear the bytes used as block cipher padding in SSL 3.0 records when operating as a client or a server that accept SSL 3.0 handshakes. As a result, in each record, up to 15 bytes of uninitialized memory may be sent, encrypted, to the SSL peer. This could include sensitive contents of previously freed memory. [CVE-2011-4576] OpenSSL support for handshake restarts for server gated cryptography (SGC) can be used in a denial-of-service attack. [CVE-2011-4619] If an application uses OpenSSL's certificate policy checking when verifying X509 certificates, by enabling the X509_V_FLAG_POLICY_CHECK flag, a policy check failure can lead to a double-free. [CVE-2011-4109] A weakness in the OpenSSL PKCS #7 code can be exploited using Bleichenbacher's attack on PKCS #1 v1.5 RSA padding also known as the million message attack (MMA). [CVE-2012-0884] The asn1_d2i_read_bio() function, used by the d2i_*_bio and d2i_*_fp functions, in OpenSSL contains multiple integer errors that can cause memory corruption when parsing encoded ASN.1 data. This error can occur on systems that parse untrusted ASN.1 data, such as X.509 certificates or RSA public keys. [CVE-2012-2110] III. Impact Sensitive contents of the previously freed memory can be exposed when communicating with a SSL 3.0 peer. However, FreeBSD OpenSSL version does not support SSL_MODE_RELEASE_BUFFERS SSL mode and therefore have a single write buffer per connection. That write buffer is partially filled with non-sensitive, handshake data at the beginning of the connection and, thereafter, only records which are longer than any previously sent record leak any non-encrypted data. This, combined with the small number of bytes leaked per record, serves to limit to severity of this issue. [CVE-2011-4576] Denial of service can be caused in the OpenSSL server application supporting server gated cryptography by performing multiple handshake restarts. [CVE-2011-4619] The double-free, when an application performs X509 certificate policy checking, can lead to denial of service in that application. [CVE-2011-4109] A weakness in the OpenSSL PKCS #7 code can lead to a successful Bleichenbacher attack. Only users of PKCS #7 decryption operations are affected. A successful attack needs on average 2^20 messages. In practice only automated systems will be affected as humans will not be willing to process this many messages. SSL/TLS applications are not affected. [CVE-2012-0884] The vulnerability in the asn1_d2i_read_bio() OpenSSL function can lead to a potentially exploitable attack via buffer overflow. The SSL/TLS code in OpenSSL is not affected by this issue, nor are applications using the memory based ASN.1 functions. There are no applications in FreeBSD base system affected by this issue, though some 3rd party consumers of these functions might be vulnerable when processing untrusted ASN.1 data. [CVE-2012-2110] The patch provided with the initial version of this advisory introduced bug to the Server Gated Cryptography (SGC) handshake code,
ANNOUNCE: [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-12:01.openssl
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 = FreeBSD-SA-12:01.opensslSecurity Advisory The FreeBSD Project Topic: OpenSSL multiple vulnerabilities Category: contrib Module: openssl Announced: 2012-05-03 Credits:Adam Langley, George Kadianakis, Ben Laurie, Ivan Nestlerode, Tavis Ormandy Affects:All supported versions of FreeBSD. Corrected: 2012-05-03 15:25:11 UTC (RELENG_7, 7.4-STABLE) 2012-05-03 15:25:11 UTC (RELENG_7_4, 7.4-RELEASE-p7) 2012-05-03 15:25:11 UTC (RELENG_8, 8.3-STABLE) 2012-05-03 15:25:11 UTC (RELENG_8_3, 8.3-RELEASE-p1) 2012-05-03 15:25:11 UTC (RELENG_8_2, 8.2-RELEASE-p7) 2012-05-03 15:25:11 UTC (RELENG_8_1, 8.1-RELEASE-p9) 2012-05-03 15:25:11 UTC (RELENG_9, 9.0-STABLE) 2012-05-03 15:25:11 UTC (RELENG_9_0, 9.0-RELEASE-p1) CVE Name: CVE-2011-4576, CVE-2011-4619, CVE-2011-4109, CVE-2012-0884, CVE-2012-2110 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit URL:http://security.FreeBSD.org/. I. Background FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. II. Problem Description OpenSSL failes to clear the bytes used as block cipher padding in SSL 3.0 records when operating as a client or a server that accept SSL 3.0 handshakes. As a result, in each record, up to 15 bytes of uninitialized memory may be sent, encrypted, to the SSL peer. This could include sensitive contents of previously freed memory. [CVE-2011-4576] OpenSSL support for handshake restarts for server gated cryptograpy (SGC) can be used in a denial-of-service attack. [CVE-2011-4619] If an application uses OpenSSL's certificate policy checking when verifying X509 certificates, by enabling the X509_V_FLAG_POLICY_CHECK flag, a policy check failure can lead to a double-free. [CVE-2011-4109] A weakness in the OpenSSL PKCS #7 code can be exploited using Bleichenbacher's attack on PKCS #1 v1.5 RSA padding also known as the million message attack (MMA). [CVE-2012-0884] The asn1_d2i_read_bio() function, used by the d2i_*_bio and d2i_*_fp functions, in OpenSSL contains multiple integer errors that can cause memory corruption when parsing encoded ASN.1 data. This error can occur on systems that parse untrusted ASN.1 data, such as X.509 certificates or RSA public keys. [CVE-2012-2110] III. Impact Sensitive contents of the previously freed memory can be exposed when communicating with a SSL 3.0 peer. However, FreeBSD OpenSSL version does not support SSL_MODE_RELEASE_BUFFERS SSL mode and therefore have a single write buffer per connection. That write buffer is partially filled with non-sensitive, handshake data at the beginning of the connection and, thereafter, only records which are longer than any previously sent record leak any non-encrypted data. This, combined with the small number of bytes leaked per record, serves to limit to severity of this issue. [CVE-2011-4576] Denial of service can be caused in the OpenSSL server application supporting server gated cryptograpy by performing multiple handshake restarts. [CVE-2011-4619] The double-free, when an application performs X509 certificate policy checking, can lead to denial of service in that application. [CVE-2011-4109] A weakness in the OpenSSL PKCS #7 code can lead to a successful Bleichenbacher attack. Only users of PKCS #7 decryption operations are affected. A successful attack needs on average 2^20 messages. In practice only automated systems will be affected as humans will not be willing to process this many messages. SSL/TLS applications are not affected. [CVE-2012-0884] The vulnerability in the asn1_d2i_read_bio() OpenSSL function can lead to a potentially exploitable attack via buffer overflow. The SSL/TLS code in OpenSSL is not affected by this issue, nor are applications using the memory based ASN.1 functions. There are no applications in FreeBSD base system affected by this issue, though some 3rd party consumers of these functions might be vulnerable when processing untrusted ASN.1 data. [CVE-2012-2110] IV. Workaround No workaround is available. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 7-STABLE, 8-STABLE or 9-STABLE, or to the RELENG_7_4, RELENG_8_3, RELENG_8_2, RELENG_8_1, RELENG_9_0 security branch dated after the correction date. 2) To
